Renewable cartridge fuse



May 25, 1943. c. J. HMS 2,320,231

RENEWABLE CARTRIDGE FUSE Filed March 21, 1941 INVENTOR 6fm/w55 J H995 ATTORNEY Patented May 25, 1943 UNITED STATES PATENT OFFICE 2,320,231 RENEWABLE oARTRmGE FUSE Charles J. Haas, New York, N. Y.

Application March 21, 1941, Serial No. 384,498

5 Claims.

A .This invention relates to renewable cartridge fuses, and is more particularly directed toward renewable cartridge fuses of the ferrule type.

The present invention contemplates the provision of renewable fuses which are susceptible of inexpensive manufacture, which are suitable for repeated use under severe conditions and wherein it is easy to renew the fuse link.

'I'he accompanying drawing shows, for purposes of illustrating the present invention, two of the many embodiments in which the invention may take form, it being understood that the drawing is illustrative of the invention rather than limiting the same.

In the drawing:

Figure 1 is a longitudinal sectional view through a cartridge fuse taken on the line I--I of Figure 2;

Figure 2 is a longitudinal sectional view on the line 2-2 of Figure 1; and

Figures 3 and 4 are cross sectional views on the lines 3-'3 and 4 4, respectively, of Figure 1.

The outer casing of the fuse is indicated at I0. While this casing may be made of any suitable insulating material it is preferably made of transparent insulating material in .order that the interior of the fuse may be seen. This feature of construction forms the subject matter of my copending application Serial No. 384,497 illed concln'rently herewith.

The casing or sleeve I receives an insulating member II which may also be -made of transparent material. This insulating member has diametrically opposite grooves I 2, I2 at the ends and a longitudinally extending slot I3 which communicates with these grooves. This slot extends all the way across the rod forming the insert II to leave two outer connecting members I4, as will be apparent` from the section of Figure 4. A fuse link I5 is received in the cut-out portions of the rod II and has its ends I6 bent over the ends of the rod II, as will be apparent from the drawing. The ends of the fuse link are apertured and the ends of the rod II are threaded as indicated at I1, I1.

End members I8, I8 ln the form end caps I9 and threaded studs 20 are provided. In assembling thfuse one end of the fuse link is bent at the proper point to bring its aperture in alignment with the threaded opening in the end of the inner rod, and an end members is threaded into place so as to securely clamp the end of thev fuse link between the shoulder on the stud and the end of the rod. The other end of of sheet metal inner rod. The outer sleeve I0 is then passed about the inner rod and fuse link and the other end member threaded in place. The lengths of the parts are such that the clamping action 'takes place between the shoulders on the studs and the ends of the insulating insert. The insulating sleeve I0 is slightly smaller than the inside diameter of the ferrule or end cap I9 and is slightly shorter than the distance between these end caps so that gases generated lwhen the fuse blows will find a ready passage through the grooves and spaces referred to.

It is obvious that the invention may be em- -bodied in many forms and constructions within the scope of the claims and I wishit to be understood that the particular forms shown are but a few of the many forms. Various modifications and changes being possible, I do not otherwise limit myself in any way with respect thereto.

What is claimed is:

l. A cartridge fuse comprising an insulating sleeve, end members including metal end caps fitted about the ends of the sleeve and having axially disposed, inwardly extending threaded studs, an insulating member received in the sleeve, and a fuse link having apertured ends bent against the ends of the insulating member and through which the threaded studs extend, the end members having shoulders bearing on the link ends when the studs are threaded tightly in place.

2. A fuse such as claimed in claim 1, wherein the insulating member has a longitudinally extending chamber through which the fuse link extends diagonally.

3. A fuse such as claimed in claim- 1, wherein the insulating member is provided with longitudinally extending grooves extending to the ends and. has a longitudinally extending fuse link receiving chamber communicating with the grooves so that gases generated on blowing of the fuse link may escape.

4. A renewable fuse having an insulating tubular casing, a removable end cap carrying an axially extending screw, an insulating rod in the casing and tapped to receive the screws, and a fuse link whose ends are clamped against the ends of the rod by the screws, the rod being cut away to provide in conjunction with the casing an explosion chamber through which the fuse link passes. Y

5. In combination, an insulating carrier for a fuse link comprising a length of cylindrical rod having axially disposed threaded holes in the the fuse link is then bent around the end of the ends, diametrically Opposite grooves near the of the rod andfscrews passing through the link ends and threaded tightly into the holes so that thecaps and link ends are in intimate electrical contact, and an outer insulating sleeve about the rod and having its ends loosely received inside the caps.

CHARLES J. HAAS. 

